Undead Labs has released this video below of a video tour of its studio as well as a look at gameplay footage of its open-world zombie shooter, known for the moment as Class 3. Currently in the early stages of alpha testing, one of the scenes in the video posted below shows the game’s ambush functionality, while another has people trying to barricade themselves in a building with one character suffering the consequences for not working fast enough. The game is slated for a release on Xbox Live upon completion, and will serve as a prequel and “platform” to its second zombie game in the works, Class 4, an MMO the firm announced back in 2009.